<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport"
    content="width=device-width,user-scalable=no,initial-scale=1.0,  maximum-scale=1.0,minimum-scale=1.0">
  <title>跳动的红心</title>
  <link rel="stylesheet" href="./style.css">
</head>

<body>
  <div id="heart">
    <div class="left"></div>
    <div class="right"></div>
    <div class="bottom"></div>
  </div>
</body>

</html>